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998 Appendix V The problem becomes :—given a shaft whose (a) Maximum Tm = 171,000 Ib.ins. To make this condition satisfy simultaneously (b) Maximum stress = 9000 Ibs. per sq. in. (c) Maximum angle of torsion = i degree in 20 ft. which it is impossible to satisfy fully. Taking (a] and (b) 1 "457" 648" DIAME.TE.R OF SHAFT 19 Taking (£) and (^), as in Example 21, p. 425, with / = 240", 7 x 36° 13,000,000